[REF] *: milk graphical assets

- apps icons
- base: replace demo avatars Mitchell, Marc and Joel
- mail: replace odoobot avatar

Part-of: odoo/odoo#116641
Co-authored-by: Elisabeth Dickinson <edi@odoo.com>

addons/payment_buckaroo/static/description/icon.svg

@@ -1 +1 @@
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